stumbled on something somewhat related to the issues with zinc-deficient wheat (higher gliadin fraction) discussed elsewhere on the site..
marking soil study 'results' section submissions, and went looking for a good published example.
found this title and the format looked good. when I got into the content I thought it was pretty interesting..:http://projects.cals.ncsu.edu/ristaino/ ... rticle.pdf
3.2 Soil chemical components
Several soil chemical factors were affected by soil fertility amendments and time (Fig. 3). Calcium concentrations in soils with alternative fertility amendments were increased two-fold over the 2-year period. In contrast, no increase in calcium concentrations occurred in soils with the synthetic fertilizers (P < 0.01, Fig. 3A). Similarly, magnesium concentrations more than doubled in soils amended with alternative fertility amendments, whereas only slight increases in magnesium concentrations were observed in soils with synthetic fertilizers over the same time period (P < 0.01, Fig. 3B). Potassium concentrations in soils amended with alternative fertility amendments increased by a factor of 3, and were higher at the end of the second year in soils with alternative amendments than in soils with synthetic fertility amendments, whereas potassium concentrations decreased over time in soils with synthetic fertilizers (P = 0.01, Fig. 3C). Soil manganese concentrations increased over time in soils amended with alternative fertility amendments, but decreased in soils with synthetic fertilizers (P = 0.02, Fig. 3D). Boron increased in soils with alternative fertility amendments over time whereas no differences in boron concentration were observed in soils with synthetic fertilizers (P = 0.003, Fig. 3E).
good rationale for choosing organic
the treatments used in this study did not differ from synthetic fertilizer wrt effect on soil zinc. which begs the next question